Well, things are different once they are grandparents. They can't bear to see the younger ones crying for long period of time.
My inlaws does the same thing too.
Moreover you are in ur 37weeks now, very likely that your LO is doing things to gain attention as you will be popping soon.
Just hang in there.
Since there is people able to help you care for your elder, just close one eye towards it.
Focus on your 2nd baby first
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Badass Momma